TABLE OF CONTENTS The next phase of a schedule is to add logic to the activities. There are two types of logic that you must deal with here:
Logic links or relationships between activities and
Imposed constraints to the activities which are covered in the next chapter.
There are four types of relationship available in SureTrak:
Finish-to-Start (FS) (also known as conventional)
Start-to-Start (SS)
Start-to-Finish (SF)
Finish-to-Finish (FF).
Other terms you must understand are:
Predecessor, an activity that controls the start or finish of another activity and
Successor, an activity whose start or finish depends on the start or finish of another activity.
Lag is a delay to a relationship, see the diagram over the next page.
Lead or Negative Lag is the opposite of a Lag, see the diagram over the next page.
The FS (or conventional) relationship looks like this:
While the SS relationship is like this:
The SF relationship looks like:
The FF relationship would be:
An example of a FS with positive lag:
and an example of a FS with negative lag:
Important You must be careful when using a lag to allow for delays such as curing concrete when the predecessor is not a seven-day calendar. The concrete will cure while the predecessor calendar has non-work days, and therefore, may be cured before SureTrak s allotted date.
There are a number of methods of adding logic to activities. We will look at the following...
